Download Earthquakes - armstrong-herrington

Earthquakes
Lesson 1
Let’s Get Quakin’
1.
What is an earthquake?
2.
What instrument records earthquakes?
3.
What makes up the outer crust of the earth? How many are there?
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4.
What do we call the place where plates meet?
5.
Name the following boundaries.
6.
Which fault would be an example of the San Andreas Fault?
7.
Which fault would be where new land is being created?
8.
Which fault shows where mountains are pushed up?
9.
Name the following faults.
Earthquakes
San Francisco Earthquake 1910
• Sudden shaking of
the ground.
• Generate seismic
waves which can
be recorded on a
sensitive
instrument called a
seismograph.
The Seismograph
• Perhaps the
earliest
seismograph
was invented in
China in A.D.
136 by a man
named Choko.
Earth’s Plates
• Broken into 12 rigid
plates which are 60200 km thick and float
on top of a more fluid
zone (magma)
• Like how icebergs
float on top of the
ocean.
• Earthquakes occur along plate
boundaries (faults)
• The Pacific plate is moving to
the northwest at a rate of about
4 inches per year.
Faults
Types of Boundaries
Divergent
Convergent
Transform
• Along the boundary
separating any two
plates, the relative
motion between the
plates can be
classified into one of 3
categories
Types of
Faults
Types of Waves
•Type of
seismic
wave that
compresses
and expands
the ground.
• Type of
seismic wave
that moves
the ground up
and down or
side to side.